High-speed steel



' i To all whom it may any, or

.rosnrn 1:. r1. cnnmrcan compan or rrr PITTSBURGH, PENNSYLVANIA, AssIeNon ro 's'rANnAn rsnunen, PENNSYLVANIA.

I .HIGH-SPEED STEEL.

1 ,210,626. Specification of F Drawing. Application filed February 1 concern: Be itknown that I, JOSEPH M. FLANNERY, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in High-Speed. Steel; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others s 'lled in the art to which it appertains to make and use the same.

This invention relates to improvements in steel alloys, and more particularly to high speed stee1,one object of theinvention being to roduce a high speed steel which shall have a ded to the qualities of tungsten thereof, similar ualities derived from the addition of anot er alloying metal which shall serve to materially reduce the quantity of tungsten used and at the same time increase the quality of the product in strength, ductility and heat-resisting properties, and enefiiciency for use as high speed tool hence its steeL, I I 4 With this andotherobjects in view, the invention consists in a certain novel high speed steel alloy as hereinafter set forth and pointed out in the claims. x

The invention further consists in, tungsten steel having uranium alloyed therewith.

' In the manufacture of my improved high speed steel, I alloy with tungsten steel, uranium in a proportion appreciably less than that of tungsten. It is now common practice in the manufacture of tungsten steel, to incorporate into a body of steel a quantity of tungsten approximately equal to -from12 to. 18 per cent. of,the'finished-product. This largepro ortion oftungsten renders the 'cost of manu acture of tungsten steel very expensive, and it is the aim of my invention to. reduce the cost of such steel by reducing the, proportion of tungsten necessar in its manufacture and at the same time increase the "efiiciency of the product in all qualities incident to high, speed steel.

I have found that by incorporating an amount ofuranium not exceeding three per cent. into tungstensteel "contaimng as low as eight per cent. tungsten, a high speed steel is produced having all the! qualities of tungsten steel containing eighteen per cent.

tungsten necessary,

in the crucible or furnace.

, tors-Patent, is

Letters Patent.

9, 1916. Serial No. 79 431.

tungsten, and that the uranium gives to the product greater efiiciency to-ughness, thermal absorption, and less brittleness An even smaller proportion of uranium than three per cent. may .b.e used with good results. I

In the manufacture of my improved high speed steel, I may employ either ferro-uranium or uranium metal, added to the bath'of' molten steel from five to ten minutes before pouring, after de-slaggmg added. The steel should be poured as soon as the uranium has become melted,this usually requiring Patented Jan. 2, 1917. i

which should be and after all other alloys havebeen from five to ten minutes unless an electric furnaoe$beemployed rather I than a crucible when less time will be required for the melting of the uranium. The presence of uranium in tungsten steel, not only greatly reduces the proportion of thus reducing the costof tungsten content and cost of manufacture of the highspeed 'steel,'but it also enhances the hardness, toughness, thermal absorption and general efliciency and durability of the product for the manufacture of cutting t'oolsfl 'The alloy may be crushed to .the desired size and applied tothe molten mass while pouring in" the ladle, or after the molten mass isin the ladle. It may also be applied described my invention what Having fully d desire to secure by Let- I claim asv new an 1. High speed tungsten steel having uranium alloyed therewith, the uranium replacing a portion of the tungsten used in ordinary tungsten steel.

p 2. High speed steel containing tungsten and uranium'in approximately the relative proportions specified.

3. High speed tungsten steel having uranium alloyed therewithin proportion less than the proportion of the tungsten content, the uranium replacing a portion of the tungsten used in ordinary tungsten steel 4. High speed tungsten steel, having uranium alloyed ,in a proportion as high as three per cent. uranium, the uranium replacing a portion of the tungsten used in ordinary tungsten steel. v

5. High speed tungsten steel, containing '2 W i g 1,210,626 I approximately eight per centfitl l-ngsten and specification in the presence of two subscribapprgixinlllately three per cent. uranium. ing'witnesses. r 6. ig speed steel, containing tungsten e 1 V and uranium, the proportion of'uranium be-, JOSEPH FLANNLRY' 5 ing less \than one-third the proportion of Witnesses:

tungsten. f WILLIAM GANLEY, In testimony whereof, I have signed this 7 H,;'B. KEARNEY. 

